Husband's in company with Irish singers (5)
I believe the answer is:
choir
'singers' is the definition.
(group of singers)
'husband's in company with irish' is the wordplay.
'husband' becomes 'h' (abbreviation).
'in' is an insertion indicator.
'company' becomes 'co' (abbreviation).
'with' is a charade indicator (letters next to each other).
'irish' becomes 'IR' (abbreviation).
'h' placed within 'co' is 'cho'.
'cho'+'ir'='CHOIR'
(Other definitions for choir that I've seen before include "set of singers" , "Band of singers" , "Chorus in church" , "Religious singers" , "Singing group" .)