Just start to suggest and insinuate (6)
I believe the answer is:
simply
'just' is the definition.
(I know that just can be written as simply)
'start to suggest and insinuate' is the wordplay.
'start to' suggests taking the first letters.
'and' says to put letters next to each other.
'insinuate' becomes 'imply' (I've seen this before).
The first letter of 'suggest' is 's'.
's'+'imply'='SIMPLY'
(Other definitions for simply that I've seen before include "In a straightforward manner" , "Merely, just" , "Without fuss" .)