Guys covering a hundred with fish eggs for one-time tennis star (7)
I believe the answer is:
mcenroe
'tennis star' is the definition.
(I've seen this before)
'guys covering a hundred with fish eggs' is the wordplay.
'guys' becomes 'men'.
'covering' is an insertion indicator.
'a hundred' becomes 'C' (Roman numeral).
'with' says to put letters next to each other.
'fish eggs' becomes 'roe' (synonyms).
'men' going around 'c' is 'mcen'.
'mcen'+'roe'='MCENROE'
'for one-time' 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 mcenroe that I've seen before include "Tennis star" , "John --, US tennis player" , "he's noted for being controversial" .)