Steps into bunk under the influence (9)
I believe the answer is:
bladdered
'under the influence' is the definition.
I can't tell whether this defines the answer.
'steps into bunk' is the wordplay.
'steps' becomes 'ladder' (ladder is a kind of steps).
'into' is an insertion indicator.
'bunk' becomes 'bed' (I've seen this in other clues).
'ladder' inserted inside 'bed' is 'BLADDERED'.
Can you help me to learn more?
(Other definitions for bladdered that I've seen before include "Well away" , "Drunk (slang)" .)