Way to enter pen, mature pet's container (8)
I believe the answer is:
birdcage
'pet's container' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'way to enter pen mature' is the wordplay.
'way' becomes 'rd' (short for road).
'to enter' means one lot of letters goes inside another.
'pen' becomes 'bic' (pen manufacturer).
'mature' becomes 'age' (synonyms).
'rd' put inside 'bic' is 'birdc'.
'birdc'+'age'='BIRDCAGE'
Can you help me to learn more?
(Other definitions for birdcage that I've seen before include "Walk in London" , "Coop" , "with plenty of bars with high-fliers inside" , "Where Polly goes" , "arrangement of bars for singer" .)