Stunned seeing safe almost forced (9)
I believe the answer is:
surprised
'stunned' is the definition.
(similar in meaning)
'safe almost forced' is the wordplay.
'safe' becomes 'sure' (I've seen this before).
'almost' means to remove the last letter (almost the whole word is kept).
'forced' becomes 'prised' (I've seen this in other clues).
'sure' with its last letter taken away is 'sur'.
'sur'+'prised'='SURPRISED'
'seeing' is the link.
(Other definitions for surprised that I've seen before include "Shocked" , "Taken unawares" , "Startled" , "left open-mouthed" , "Caught in the act" .)