Crossword Genius

Top expert on breakers (7)

Ross

I believe the answer is:

surface

'top' is the definition.
(thesaurus)

'expert on breakers' is the wordplay.
'expert' becomes 'ace' (ace is a kind of expert).
'on' is a charade indicator (letters next to each other).
'breakers' becomes 'surf' ('surf' can be a synonym of 'breakers').
'ace' after 'surf' is 'SURFACE'.

(Other definitions for surface that I've seen before include "Outside; rise to the top" , "Become apparent" , "Superficial appearance" , "Outside part" , "Top spot" .)

I've seen this clue in The Telegraph.
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