Allotment raised to meet specifications (7,2)
I believe the answer is:
measure up
'meet specifications' is the definition.
(measure up can mean to meet required criteria)
'allotment raised' is the wordplay.
'allotment' becomes 'measure' (allotment can mean a measure or portion).
'raised' becomes 'up' (similar in meaning).
'measure'+'up'='MEASURE UP'
'to' is the link.
(Other definitions for measure up that I've seen before include "Have what it takes" , "Reach required standard" , "take dimensions" , "Cut the mustard" , "determine the altitude?" .)