Drop Declan Rice, initially with no difficulty (8)
I believe the answer is:
decrease
'drop' is the definition.
(I've seen this before)
'declan rice initially with no difficulty' is the wordplay.
'declan' becomes 'dec' (nickname for Declan).
'initially' suggests taking the first letters.
'with no difficulty' becomes 'ease' (I've seen this in other clues).
The initial letter of 'rice' is 'r'.
'dec'+'r'+'ease'='DECREASE'
(Other definitions for decrease that I've seen before include "Reduction" , "Grow smaller or less" , "Reduce, lessen" , "Make smaller or fewer" , "Peter out" .)