For that reason I’m not sure about appearing in The Times (7)
I believe the answer is:
thereby
'for that reason' is the definition.
(I've seen this before)
'i'm not sure about appearing in the times' is the wordplay.
'i'm not sure' becomes 'er' (expression of hesitation).
'about' shows that the letters should be reversed in order.
'appearing in' means one lot of letters goes inside another.
'times' becomes 'by' (both can mean 'multiplied by').
'er' reversed gives 're'.
'the'+'by'='theby'
're' put inside 'theby' is 'THEREBY'.
(Other definitions for thereby that I've seen before include "In consequence" , "By that means" , "As a result of that" , "For that reason" , "about that amount" .)