Bucket of friend I put inside (4)
I believe the answer is:
pail
'bucket' is the definition.
(synonyms)
'friend i put inside' is the wordplay.
'friend' becomes 'pal' (pal is a kind of friend).
'put inside' is an insertion indicator.
'pal' going around 'i' is 'PAIL'.
'of' is the link.
(Other definitions for pail that I've seen before include "Open-topped container" , "it may go down well" , "Cylindrical vessel" , "Milkmaid's bucket?" , "Container; sounds like dim" .)