Crossword Genius

Touch old volume this writer has penned (4)

Ross

I believe the answer is:

move

'touch' is the definition.
(I've seen this in another clue)

'old volume this writer has penned' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'volume' becomes 'v' (abbreviation for volume in book titles).
'this writer' becomes 'me' (the person who is writing these clues).
'has penned' means one lot of letters goes inside another (inserted letters are enclosed or penned in).
'o'+'v'='ov'
'ov' put within 'me' is 'MOVE'.

(Other definitions for move that I've seen before include "Turn (at e.g. chess)" , "Go, transport" , "Go; change opinion" , "change position on board" , "Relocate" .)

I've seen this clue in The Telegraph.
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