Wise to keep boat free from enemy wreckage (8)

I believe the answer is:

sabotage

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

'enemy wreckage' is the definition.
'sabotage' can be an answer for 'wreckage' (thesaurus). I'm not certain of the 'enemy' bit.

'wise to keep boat free' is the wordplay.
'wise' becomes 'sage' (similar in meaning).
'to keep' indicates putting letters inside.
'free' indicates an anagram.
'boat' is an anagram of 'abot'.
'sage' enclosing 'abot' is 'SABOTAGE'.

'from' acts as a link.

Can you help me to learn more?

(Other definitions for sabotage that I've seen before include "Deliberate and malicious destruction" , "Scupper" , "Deliberate act of destruction or disruption" , "Vandalism" , "spoil things" .)

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

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