Imagine new face following procedure's conclusion (8)
I believe the answer is:
envisage
'imagine' is the definition.
(I know that imagine can be written as envisage)
'new face following procedure's conclusion' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'face' becomes 'visage' (visage is a kind of face).
'following' means one lot of letters go next to another.
'conclusion' indicates one should take the final letters.
The last letter of 'procedure' is 'e'.
'n'+'visage'='nvisage'
'nvisage' put after 'e' is 'ENVISAGE'.
(Other definitions for envisage that I've seen before include "Mentally picture" , "Form a mental picture of (something)" , "Form a mental image of" , "Visualise, imagine" , "Consider, contemplate" .)