I complain about pleasant girl (5)
I believe the answer is:
naomi
'pleasant girl' is the definition.
'Naomi' can be an answer for 'girl' (girl's name). I am unsure of the 'pleasant' bit.
'i complain about' is the wordplay.
'complain' becomes 'moan' (moan can mean to complain or whinge).
'about' says the letters should be written in reverse.
'i'+'moan'='imoan'
'imoan' in reverse letter order is 'NAOMI'.
Can you help me to learn more?
(Other definitions for naomi that I've seen before include "Do I moan about Biblical Ruth's mother-in-law?" , "woman in the Bible" , "Biblical woman" , "Girl's name -- I moan (anag)" , "mother- in-law" .)