Husband shows reticence (7)
I believe the answer is:
I believe this clue is a double definition.
'husband' is the first definition.
'reticence' is the second definition.
(I know that reticence can be written as reserve)
'shows' is the link.
(Other definitions for reserve that I've seen before include "8 [RESTRAINT]" , "Hold back" , "keep for oneself" , "not in the front line" , "Keep back - book" .)