Warning: beer leads to recall trouble (5)
I believe the answer is:
alert
'warning' is the definition.
(alert is a kind of warning)
'beer leads to recall trouble' is the wordplay.
'beer' becomes 'ale' (I've seen this before).
'leads to' indicates taking the first letters.
The first letters of 'recall trouble' is 'rt'.
'ale'+'rt'='ALERT'
(Other definitions for alert that I've seen before include "Watchful and bright" , "Vigilant - warning" , "Awake, attentive" , "On one's toes" , "Put on guard, warn" .)