Cry out for endless orange squash! (5)
I believe the answer is:
groan
'cry out' is the definition.
(thesaurus)
'endless orange squash' is the wordplay.
'endless' means to remove the last letter.
'squash' is an anagram indicator (I've seen this in other clues).
'orange' with its final letter removed is 'orang'.
'orang' with letters rearranged gives 'GROAN'.
'for' is the link.
(Other definitions for groan that I've seen before include "See 18 Down" , "Moan, grumble" , "Complaint" , "Sound of pain or disapproval" , "Cry of pain or despair" .)