Gents perhaps need whipping, and this one needs tying up! (5,3)
I believe the answer is:
loose end
'this one needs tying up' is the definition.
(as in tying up loose ends)
'gents perhaps need' is the wordplay.
'gents' becomes 'loos' (gents toilets).
'perhaps' is an anagram indicator.
'need' is an anagram of 'eend'.
'loos'+'eend'='LOOSE END'
'whipping and' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for loose end that I've seen before include "As yet unexplained detail" , "should have been tied?" , "The bored, idle at one" , "where one's idling" , "Detail not yet settled" .)