Small answer elsewhere needs brains to come first? (9)

I believe the answer is:

spearhead

'come first?' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for spearhead that I've seen before include "initiate attack" , "front" , "Take charge of" , "Advanced troops" , "Take the lead in" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app