Crossword Genius

Ungenerous period for interval (8)

Ross

I believe the answer is:

meantime

'interval' is the definition.
(meantime is a kind of interval)

'ungenerous period' is the wordplay.
'ungenerous' becomes 'mean' ('mean' can be similar in meaning to 'ungenerous').
'period' becomes 'time' (time is a kind of period).
'mean'+'time'='MEANTIME'

'for' is the link.

(Other definitions for meantime that I've seen before include "Intervening period" , "For the moment" , "interim?" , "interval" .)

I've seen this clue in The Telegraph.
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