Paying after trees get bit of trim in seasonal visit (5-7)
I believe the answer is:
first-footing
'seasonal visit' is the definition.
(Scottish custom of house visits in a new year)
'paying after trees get bit of' is the wordplay.
'paying' becomes 'footing' (footing is a kind of paying).
'after' says to put letters next to each other.
'trees' becomes 'firs' (fir is a kind of tree).
'get bit of' becomes 't' (I can't explain this - if you can you should believe this answer much more).
'firs'+'t'='first'
'footing' after 'first' is 'FIRST-FOOTING'.
'trim in' 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 first-footing that I've seen before include "Seasonal activity" , "Scottish custom" .)