Blank about having the last single talus (9)

I believe the answer is:

anklebone

'talus' is the definition.
(synonyms)

'blank about having the last single' is the wordplay.
'about' is an anagram indicator.
'having' means one lot of letters goes inside another.
'last' indicates one should take the final letters.
'single' becomes 'one' (a single thing - only one).
The last letter of 'the' is 'e'.
'blank' is an anagram of 'anklb'.
'anklb' enclosing 'e' is 'ankleb'.
'ankleb'+'one'='ANKLEBONE'

(Another definition for anklebone that I've seen is " Talus".)

I've seen this clue in The Daily Express.

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