Only just pay for (4)
I believe the answer is:
meet
This clue might be a double definition.
'only just' is the first definition.
'meet' can be an answer for 'just' (similar in meaning). I am unsure of the 'only' bit.
'pay for' is the second definition.
'meet' can be an answer for 'pay' (thesaurus). I'm unsure of the 'for' bit.
Can you help me to learn more?
(Other definitions for meet that I've seen before include "Get together socially or for business" , "sporting occasion" , "assembly at hunt" , "Converge" , "club" .)