Crowd heading for stadium - getting near? (5)
I believe the answer is:
swarm
'crowd' is the definition.
(swarm is a kind of crowd)
'heading for stadium getting near?' is the wordplay.
'heading for' says to take the initial letters.
'getting' is a charade indicator (letters next to each other).
'near?' becomes 'warm' ('warm' can mean 'near' in a guessing game).
The first letter of 'stadium' is 's'.
's'+'warm'='SWARM'
(Other definitions for swarm that I've seen before include "Host" , "Large group of flying insects" , "Large group of bees" , "Go to form new colony" , "Moving crowd, of bees say" .)