Inflexible, a guy surrounded by detailed facts and figures (7)
I believe the answer is:
adamant
'inflexible' is the definition.
('adamant' can be similar in meaning to 'inflexible')
'a guy surrounded by detailed facts and figures' is the wordplay.
'guy' becomes 'man' (I've seen this before).
'surrounded by' indicates putting letters inside.
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'facts and figures' becomes 'data' (I've seen this before).
'data' with its last letter taken off is 'dat'.
'man' put within 'dat' is 'damant'.
'a'+'damant'='ADAMANT'
(Other definitions for adamant that I've seen before include "Fabulous rock" , "Completely determined" , "Unswerving" , "Decided" , "Determined and unyielding to requests" .)