Carry secure SunSmart hat,… (8)

I believe the answer is:

havelock

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'sunsmart hat' is the definition.
I can't tell whether this defines the answer.

'carry secure' is the wordplay.
'carry' becomes 'have' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'secure' becomes 'lock' (locking is a kind of securing).
'have'+'lock'='HAVELOCK'

Can you help me to learn more?

(Another definition for havelock that I've seen is " soldier's cap".)

I've seen this clue in the Sydney Morning Herald.

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