Retiring worker seen in a humble dwelling (6)
I believe the answer is:
shanty
'a humble dwelling' is the definition.
'shanty' can be an answer for 'dwelling' (I have seen 'Ramshackle dwelling' mean 'shanty' so perhaps 'dwelling' could also mean 'shanty'). I'm not sure about the 'a humble' bit.
'retiring worker seen in' is the wordplay.
'retiring' becomes 'shy' (both can mean reserved or introverted).
'worker' becomes 'ant' (worker is a type of ant).
'seen in' means one lot of letters goes inside another.
'shy' placed around 'ant' is 'SHANTY'.
Can you help me to learn more?
(Other definitions for shanty that I've seen before include "Small crude dwelling" , "shed" , "A sailor's traditional song" , "Sailor's work song - ramshackle hut" , "low abode" .)