To us, perhaps, the titular head is strong (5)
I believe the answer is:
stout
'strong' is the definition.
(thesaurus)
'to us perhaps the titular head' is the wordplay.
'perhaps' indicates anagramming the letters.
'head' suggests taking the first letters.
The first letter of 'titular' is 't'.
'to'+'us'='tous'
'tous' with letters rearranged gives 'stou'.
'stou'+'t'='STOUT'
'is' is the link.
(Other definitions for stout that I've seen before include "Overweight; porter" , "Inured to fatigue and hardship" , "Thick; beer" , "Rather fat, stocky" , "Rather fat, drink" .)