I jettison crop that's failed one screening (13)

I believe the answer is:

projectionist

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'one screening' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'i jettison crop that's failed' is the wordplay.
'that's failed' is an anagram indicator.
'i'+'jettison'+'crop'='ijettisoncrop'
'ijettisoncrop' anagrammed gives 'PROJECTIONIST'.

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(Other definitions for projectionist that I've seen before include "Cinema employee" , "Cinema worker" .)

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