Does sleeping on it tangle the hair? (8)
I believe the answer is:
mattress
'does sleeping on it' is the definition.
I can't tell whether this definition defines the answer.
'tangle the hair?' is the wordplay.
'tangle' becomes 'mat' (synonyms).
'the hair?' becomes 'tress' (tress is a kind of hair).
'mat'+'tress'='MATTRESS'
Can you help me to learn more?
(Other definitions for mattress that I've seen before include "Large thick pad on the bed" , "Flat sleeping pad" , "Sleeping support" , "Pad to sleep on" , "Nap on this" .)