The female at the rear, waving, is a farm worker (7)
I believe the answer is:
shearer
'worker' is the definition.
(I know that shearer is a type of working man)
'the female at the rear waving' is the wordplay.
'the female' becomes 'she' ('she' refers to a woman).
'at' means one lot of letters go next to another.
'waving' indicates anagramming the letters (letters wave around).
'rear' anagrammed gives 'arer'.
'she'+'arer'='SHEARER'
'is a farm' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for shearer that I've seen before include "one who removes coat" , "Sheep barber?" , "Wool cutter - ex-England footballer" , "One that's fleeced" , "who was really on the ball?" .)