Lively beer -- right temperature (5)

I believe the answer is:

alert

'lively' is the definition.
(I've seen this before)

'beer right temperature' is the wordplay.
'beer' becomes 'ale' (I've seen this before).
'right' becomes 'r' (common abbreviation).
'temperature' becomes 't' (abbreviation).
'ale'+'r'+'t'='ALERT'

(Other definitions for alert that I've seen before include "Wide awake and watchful" , "Warning signal" , "Signal danger" , "Danger warning" , "In state of watchfulness" .)

I've seen this clue in The Telegraph.

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