Cry quietly having dispatched one large lemon? (6)
I believe the answer is:
yellow
'lemon?' is the definition.
(lemon is a kind of yellow)
'cry quietly having dispatched one large' is the wordplay.
'cry' becomes 'yell' (synonyms).
'quietly' becomes 'low' (I've seen this in another clue).
'having dispatched' suggests deleting specific letters.
'one large' becomes 'L' (eg in clothes sizes).
'low' with 'l' taken away is 'ow'.
'yell'+'ow'='YELLOW'
(Other definitions for yellow that I've seen before include "centre of egg" , "Custardy shade" , "Sunny colour" , "Sort of hammer, jersey or belly" , "Colour of the fever flag" .)