Skills of adult bisexual inside of slip knots (9)

I believe the answer is:

abilities

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'skills' is the definition.
(skill can mean an ability)

'adult bisexual inside of slip knots' is the wordplay.
'adult bisexual' becomes 'abi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'inside of' says to take the centre.
'knots' becomes 'ties' (I've seen this in another clue).
The middle letters of 'slip' are 'li'.
'abi'+'li'+'ties'='ABILITIES'

'of' is the link.

Can you help me to learn more?

(Other definitions for abilities that I've seen before include "skills" , "The powers to do" , "Talents" .)

I've seen this clue in The Independent.

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