Crossword Genius

If you’re lacking confidence, it’s not safe (8)

Ross

I believe the answer is:

insecure

I'm a little stuck... Click here to teach me more about this clue!

'if you're lacking confidence' is the definition.
I can't tell whether this defines the answer.

'it's not safe' is the wordplay.
'it's not' becomes 'in' (this could be a standard abbreviation I've not previously seen).
'safe' becomes 'secure' (synonyms).
'in'+'secure'='INSECURE'

Can you help me to learn more?

(Other definitions for insecure that I've seen before include "Sinecure arranged for the nervous" , "Not adequately protected" , "Timid" , "Lacking self-confidence or assurance" , "Sinecure for those lacking in confidence" .)

I've seen this clue in the Evening Standard.
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