Love, encapsulated by dance band (4)
I believe the answer is:
hoop
'band' is the definition.
(hoop is a kind of band)
'love encapsulated by dance' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'encapsulated by' means one lot of letters goes inside another (I've seen this in other clues).
'dance' becomes 'hop' (hop is a kind of dance**).
'o' placed into 'hop' is 'HOOP'.
(Other definitions for hoop that I've seen before include "Circlet" , "children's toy" , "Wood, metal or plastic band" , "Metal ring for croquet and basketball" , "Arch used in croquet" .)