Appreciate Juliet in that role finally reversed (5)
I believe the answer is:
enjoy
'appreciate' is the definition.
(I've seen this before)
'juliet in that role finally reversed' is the wordplay.
'juliet' becomes 'J' (phonetic alphabet: alpha, bravo, charlie etc.).
'in' means one lot of letters goes inside another.
'that' becomes 'yon' (archaic term meaning 'that').
'finally' says to take the final letters.
'reversed' is a reversal indicator.
The final letter of 'role' is 'e'.
'yon'+'e'='yone'
'j' going into 'yone' is 'yojne'.
'yojne' backwards is 'ENJOY'.
(Other definitions for enjoy that I've seen before include "Make merry" , "Have the benefit of" , "Savour - relish" , "Delight in (something)" , "Derive pleasure from" .)