Husband has beer to be strong (4)
I believe the answer is:
hale
'strong' is the definition.
(I've seen this in other clues)
'husband has beer' is the wordplay.
'husband' becomes 'h'.
'has' says to put letters next to each other.
'beer' becomes 'ale' (type of beer).
'h'+'ale'='HALE'
'to be' is the link.
(Other definitions for hale that I've seen before include "Strong and healthy" , "Healthy and robust" , "Well" , "Sound of body" , "Healthy and hearty" .)