Crossword Genius

Is Isaac oddly withdrawn about mount which Abraham was up on? (3)

Ross

I believe the answer is:

ass

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

'mount which abraham was up on?' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'is isaac oddly withdrawn' is the wordplay.
'oddly' indicates alternate letters (letters in odd-numbered positions).
'withdrawn' is a reversal indicator.
'is'+'isaac'='isisaac'
The alternating letters of 'isisaac' are 'ssa'.
'ssa' backwards is 'ASS'.

'about' is the link.

Can you help me to learn more?

(Other definitions for ass that I've seen before include "Turkey" , "transporter" , "Small hoofed animal" , "Dipstick" , "Blockhead" .)

I've seen this clue in The Independent.
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