Remote daughter first joins worker (7)
I believe the answer is:
distant
'remote' is the definition.
(similar in meaning)
'daughter first joins worker' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'first' becomes 'ist' (ist resembles 1st).
'joins' means one lot of letters go next to another.
'worker' becomes 'ant' (worker is a type of ant).
'd'+'ist'+'ant'='DISTANT'
(Other definitions for distant that I've seen before include "Reserved - a long way off" , "Remote in time or place" , "Absent - coming from a far-away place" , "Unfriendly; far off" , "cool" .)