Pay for service (3)
I believe the answer is:
fee
This clue could be a double definition.
'pay' is the first definition.
(thesaurus)
'service' is the second definition.
The definition and answer can be both to do with social activities as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'for' acts as a link.
Can you help me to learn more?
(Other definitions for fee that I've seen before include "Sum payable to, say, barrister" , "price" , "Money paid for professional services" , "Payment to a professional for services" , "Amount paid for job" .)