Old man to manage wisely (7)
I believe the answer is:
husband
This clue could be a double definition.
'old man' is the first definition.
(thesaurus)
'manage wisely' is the second definition.
'husband' can be an answer for 'manage' (I've seen this before). I'm not certain of the 'wisely' bit.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for husband that I've seen before include "manage thriftily" , "Use economically - partner" , "Male relative" , "Partner; use carefully" , "Partner in marriage" .)