Crossword Genius

Period when expecting con­clusion from beat poet (9)

Ross

I believe the answer is:

trimester

'period when expecting' is the definition.
(period of time when expecting a baby)

'conclusion from beat poet' is the wordplay.
'conclusion from' suggests the final letters.
'poet' becomes 'rimester' (alternative spelling of rhymester).
The final letter of 'beat' is 't'.
't'+'rimester'='TRIMESTER'

(Other definitions for trimester that I've seen before include "Period of three months" , "part of college year" , "American term" , "academic session" , "US academic term" .)

I've seen this clue in The Guardian.
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