Cleaner has mop mended before round (7)
I believe the answer is:
shampoo
'cleaner' is the definition.
(shampoo cleans hair)
'has mop mended before round' is the wordplay.
'mended' indicates anagramming the letters.
'before' says to put letters next to each other.
'round' becomes 'o' (o is a circular letter).
'has'+'mop'='hasmop'
'hasmop' anagrammed gives 'shampo'.
'shampo'+'o'='SHAMPOO'
(Other definitions for shampoo that I've seen before include "Hair-care product" , "Liquid cleaner" , "Cleaner for locks" , "detergent" , "16 21 [INDIAN IMPORT]" .)