Dancer lying about conviction, yet no further checks? (7)
I believe the answer is:
fonteyn
'dancer lying' is the definition.
The definition suggests a singular noun which matches the answer.
'about conviction yet no further checks?' is the wordplay.
'about' says the letters should be written in reverse.
'checks?' indicates a hidden word (I've seen 'checks' mean this (check can mean to curb or restrain)).
'nyetnof' is hidden within 'conviction yet no further'.
'nyetnof' backwards is 'FONTEYN'.
Can you help me to learn more?
(Other definitions for fonteyn that I've seen before include "'Margot ..., prima ballerina (7)'" , "Dame Margot --, ballet dancer" , "Margot ..., English prima ballerina" , "Margot ..., iconic English ballerina" , "Danseuse" .)