Working together at home on tackle (2,7)
I believe the answer is:
in harness
'working together' is the definition.
(I've seen this before)
'home on tackle' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'on' means one lot of letters go next to another.
'tackle' becomes 'harness' (I've seen this before).
'in'+'harness'='IN HARNESS'
'at' acts as a link.
(Other definitions for in harness that I've seen before include "Performing routine daily work" , "Working together" .)