Adult in pound store ejecting English dog (5)
I believe the answer is:
laika
'dog' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'adult in pound store ejecting english' is the wordplay.
'adult in pound' becomes 'la' (I can't explain this - if you can you should believe this answer much more).
'store' becomes 'IKEA' (furniture shop).
'ejecting' suggests deleting specific letters.
'english' becomes 'E' (abbreviation).
'ikea' with 'e' removed is 'ika'.
'la'+'ika'='LAIKA'
Can you help me to learn more?
(Other definitions for laika that I've seen before include "early space traveller" , "Soviet dog in space" , "First dog in orbit" .)