Insinuated that the naughty child was a fibber too (7)
I believe the answer is:
implied
'insinuated' is the definition.
(I've seen this before)
'the naughty child was a fibber too' is the wordplay.
'the naughty child' becomes 'imp' (I've seen this before).
'was a fibber too' becomes 'lied' (I can't justify this - if you can you should believe this answer much more).
'imp'+'lied'='IMPLIED'
'that' acts as a link.
Can you help me to learn more?
(Other definitions for implied that I've seen before include "State indirectly" , "Suggested; not explicit" , "I limped in hinted or suggested way" , "Insinuated, hinted" , "Understood" .)