Have sufficient funds for a fine crossing (6)
I believe the answer is:
afford
'have sufficient funds for' is the definition.
(as in being able to afford something)
'a fine crossing' is the wordplay.
'a fine' becomes 'af' (I've seen this in other clues).
'crossing' becomes 'ford' (synonyms).
'af'+'ford'='AFFORD'
(Other definitions for afford that I've seen before include "Have the financial means" , "Able to bear the cost of" , "Able to bear the expense" , "Provide (an opportunity)" , "Have the means to pay" .)