The phrase "a standby for" is correct and usable in written English.
It can be used to indicate something or someone that serves as a substitute or backup in case the primary option is unavailable.
Example: "In case the main speaker cannot attend the event, we have a standby for the presentation."
Alternatives: "a backup for" or "a substitute for".
Craft has dispensed with the grill, a standby for healthful cooking.
GARAGEBAND Apple's desktop version of GarageBand has long been a standby for hobbyists and professionals, but the mobile version ($5) is better suited to the masses.
Talk story about Bramwell Fletcher who for 16 months has been a standby for Rex Harrison & Edward Mulhare in "My Fair Lady".
And by now the high-concept, lowish-budget restaurant has become a destination for Manhattanites, as well as a standby for locals, with or without oversize baseball caps.
This, in turn, led to his "Exotic Plant Manual," a standby for professionals and aesthetes, with more than 7,000 plant photos.
The 20-year-old was named as a standby for Roy Hodgson's England World Cup squad after an impressive debut season at Everton and won his first cap for the national side at the end of May.
This payment is directed for maintaining a standby capacity for such things as burn units and trauma centers; these payments are not for resident training costs.
Filson has been a Seattle standby for a century and more, with its signature waxed-canvas jackets covering the bodies of the hip, the outdoorsy and the tourists alike.
A supply that would drive my system for 15 minutes would cost about $300 for a standby unit, $450 for a line-interactive or $600 for an online model.
Singh et al. (2005) analyzed a three-unit standby system of water pumps in which two units were operative simultaneously and the third one was a cold standby for an ash handling plant.
On any given trip, a business traveler might reasonably need to pay an extra fee for a checked bag, an exit-row seat as well as a standby reservation for an alternate flight.
