Harass endlessly for a brooch (5)
I believe the answer is:
badge
'brooch' is the definition.
The definition and answer can be both to do with contact as well as being verbs in their base form.
Maybe you can see an association between them that I can't see?
'harass endlessly' is the wordplay.
'harass' becomes 'badger' (synonyms).
'endlessly' means to remove the last letter.
'badger' with its last letter taken off is 'BADGE'.
'for a' acts as a link.
Can you help me to learn more?
(Other definitions for badge that I've seen before include "Worn emblem" , "Insignia (of office?)" , "Identity symbol" , "Symbol worn, to indicate membership perhaps" , "Thing worn to show, say, membership of organisation" .)