Listen, as husband, with attention and range of knowledge (7)
I believe the answer is:
hearken
'listen' is the definition.
(hearkening is a kind of listening)
'husband with attention and range of knowledge' is the wordplay.
'husband' becomes 'h'.
'with' is a charade indicator (letters next to each other).
'attention' becomes 'ear' (ear is a kind of attention).
'and' means one lot of letters go next to another.
'range of knowledge' becomes 'ken' (I've seen this before).
'h'+'ear'+'ken'='HEARKEN'
'as' acts as a link.
(Other definitions for hearken that I've seen before include "Listen in old way" , "Old attend" .)