Joins dad's ensemble (4)
I believe the answer is:
adds
'joins' is the definition.
Although both the answer and definition are verbs in their -s form, I don't see how one could define the other.
'dad's ensemble' is the wordplay.
'ensemble' indicates an anagram.
'dads' is an anagram of 'ADDS'.
Can you help me to learn more?
(Other definitions for adds that I've seen before include "Aggregates or makes further remark" , "Reckons" , "Aggregates or appends" , "Sums, totals" , "Appends; Totals" .)