Wrong to go to Paris to secure good radio operator? (9)

'radio operator?' is the definition.
(someone sending radio signals)

'wrong to go to paris to secure good' is the wordplay.
'wrong' becomes 'sin' (wrong can mean a sin or crime).
'to go to paris' becomes 'aller' (the verb 'to go' in French).
'to secure' is an insertion indicator (inserted letters are secured inside).
'good' becomes 'g' (abbreviation).
'sin'+'aller'='sinaller'
'sinaller' placed around 'g' is 'SIGNALLER'.