Old writer on about Sir Len Hutton? (6)
I believe the answer is:
opener
'sir len hutton?' is the definition.
(Len Hutton was a cricket opener)
'old writer on about' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'writer' becomes 'pen' (something which writes).
'on' becomes 're' ('on' can be mean 'with reference to').
'about' says the letters should be written in reverse.
're' backwards is 'er'.
'o'+'pen'+'er'='OPENER'
(Other definitions for opener that I've seen before include "Device for accessing contents of tins or bottles" , "number one or two?" , "introduction" , "device for getting at the drink" , "Batsman who starts innings" .)