Chap engulfed in an avalanche (4)

I believe the answer is:

alan

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'chap engulfed in an avalanche' is the definition.
'alan' can be an answer for 'chap' (a chap named alan). I am unsure of the 'engulfed in an avalanche' bit.

'in an avalanche' is the wordplay.
'in' says the answer is hidden in the clue.
'ALAN' is hidden in the letters of 'avalanche'.

Can you help me to learn more?

(Other definitions for alan that I've seen before include "Sir -- Sugar (The Apprentice)" , "-- Bennett, playwright" , "One of Robin Hood's men was - a Dale" , "A.A. Milne's first name" , "Lana (anag.), man's name" .)

I've seen this clue in the Evening Standard.

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