One’s behind the times — a very tricky situation (7)
I believe the answer is:
impasse
'a very tricky situation' is the definition.
'impasse' can be an answer for 'situation' (I have seen 'Situation of deadlock ' mean 'impasse' so perhaps 'situation' could also mean 'impasse'). I am unsure of the 'a very tricky' bit.
'one's behind the times' is the wordplay.
'one's' becomes 'I'm' ('one is' is a formal way of saying 'I am').
'behind the times' becomes 'passe' (I've seen this in another clue).
'im'+'passe'='IMPASSE'
Can you help me to learn more?
(Other definitions for impasse that I've seen before include "There's no way past it" , "hopeless difficulty" , "Inescapable perdicament, dilemma" , "Situation of deadlock" , "nothing can be done" .)