He will be in a terrible place (4)
I believe the answer is:
hell
'be in a terrible place' is the definition.
'hell' can be an answer for 'place' (I have seen 'Infernal place' mean 'hell' so perhaps 'place' could also mean 'hell'). I'm not sure about the 'be in a terrible' bit.
'he will' is the wordplay.
'will' becomes ''ll' (contracted form, as in 'he'll' - 'he will').
'he'+'ll'='HELL'
Can you help me to learn more?
(Other definitions for hell that I've seen before include "'The road to . . . . is paved with good intentions'" , "Place of suffering" , "Place of vice, misery or turmoil" , "Infernal place" , "One of spelt out words" .)