In the end, I see, bit too fussy (7)
I believe the answer is:
finical
'fussy' is the definition.
(synonyms)
'in the end i see' is the wordplay.
'in' indicates putting letters inside.
'the end' becomes 'final' (I've seen this before).
'see' becomes 'C' (the word for the letter, according to Chambers).
'i'+'c'='ic'
'final' going around 'ic' is 'FINICAL'.
'bit too' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for finical that I've seen before include "Pernickety" , "Very fussy" .)