Crossword Genius

Experts in aerospace science (4)

Ross

I believe the answer is:

aces

'experts' is the definition.
(ace is a kind of expert)

'in aerospace science' is the wordplay.
'in' indicates a hidden word.
'ACES' is hidden within 'aerospace science'.

(Other definitions for aces that I've seen before include "Top cards or people" , "never come back" , "Playing cards with single pips on their faces" , "holes in one" , "Champions" .)

I've seen this clue in The Guardian.
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