Crossword Genius

Drove Sierra close (5)

Ross

I believe the answer is:

swarm

'drove' is the definition.
(synonyms)

'sierra close' is the wordplay.
'sierra' becomes 'S' (phonetic alphabet: alpha, bravo, charlie etc.).
'close' becomes 'warm' (similar in meaning).
's'+'warm'='SWARM'

(Other definitions for swarm that I've seen before include "Host" , "Hive" , "Large cloud (of insects)" , "Mass of bees" , "Dense cloud (of insects)" .)

I've seen this clue in The Telegraph.
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