A lot of hair to clean up (3)
I believe the answer is:
mop
'clean up' is the definition.
(I've seen this in another clue)
'a lot of hair' is the wordplay.
'a lot' becomes 'm'.
'of hair' becomes 'op' (I am not sure about this - if you are sure you should believe this answer much more).
'm'+'op'='MOP'
'to' is the link.
Can you help me to learn more?
(Other definitions for mop that I've seen before include "Bundle of soft material at end of stick for cleaning" , "Swab" , "Hair, unkempt" , "Shock of hair; soak (up)" , "Implement for washing floor" .)