Pinch a day some weeks after Easter (7)
I believe the answer is:
whitsun
'easter' is the definition.
(thesaurus)
'pinch a day' is the wordplay.
'pinch' becomes 'whit' (I can't explain this - if you can you should give a lot more credence to this answer).
'a day' becomes 'sun' (abbreviation for Sunday).
'whit'+'sun'='WHITSUN'
'some weeks after' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for whitsun that I've seen before include "Holy Spirit festival" , "Wins hut on short Christian Sabbath" , "Feast" , "Pentecost season" , "holiday?" .)