Crossword Genius

Small enthusiastic crowd (5)

Ross

I believe the answer is:

swarm

'crowd' is the definition.
(I know that swarm is a type of crowd)

'small enthusiastic' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'enthusiastic' becomes 'warm' (I've seen this before).
's'+'warm'='SWARM'

(Other definitions for swarm that I've seen before include "Army" , "Body of bees" , "Horde" , "some setting up colony" , "Large crowd" .)

I've seen this clue in The Telegraph.
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