Key worker's supporting sailor's international body is more than enough (8)
I believe the answer is:
abundant
'more than enough' is the definition.
(I've seen this before)
'key worker's supporting sailor's international body' is the wordplay.
'key' becomes 'd' (I've seen this in other clues).
'worker' becomes 'ant' (worker is a type of ant).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'sailor' becomes 'ab' (abbreviation for able seaman).
'international body' becomes 'UN' (short for United Nations).
'd'+'ant'='dant'
'ab'+'un'='abun'
'dant' put after 'abun' is 'ABUNDANT'.
'is' is the link.
(Other definitions for abundant that I've seen before include "Bountiful" , "Present in great quantity" , "Copious, profuse" , "Luxuriant" , "'Copious, galore (8)'" .)