Floor-covering found in Berlin once (4)
I believe the answer is:
lino
'floor-covering' is the definition.
I can't judge whether this definition defines the answer.
'in berlin once' is the wordplay.
'in' says the answer is hidden in the clue.
'LINO' is hidden within 'berlin once'.
'found' is the link.
Can you help me to learn more?
(Other definitions for lino that I've seen before include "Floor covering (abbr)" , "Tough floor covering" , "put this down?" , "'Floor covering, in short (4)'" .)