Briefly the captain I have can't get away (7)

I believe the answer is:

captive

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'can't get away' is the definition.
I can't judge whether this definition defines the answer.

'briefly the captain i have' is the wordplay.
'briefly the captain' becomes 'capt' (abbreviation; 'briefly' indicates an abbreviation).
'i have' becomes 'I've' (contraction of 'I have').
'capt'+'ive'='CAPTIVE'

Can you help me to learn more?

(Other definitions for captive that I've seen before include "Prisoner" , "Detainee" .)

I've seen this clue in The Irish News.

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