Miserable deer seen outside Ram's Head (6)
I believe the answer is:
morose
'miserable' is the definition.
(I've seen this before)
'deer seen outside ram's head' is the wordplay.
'deer' becomes 'moose' (moose is a kind of deer).
'seen outside' means one lot of letters goes inside another.
'ram's head' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'moose' placed around 'r' is 'MOROSE'.
Can you help me to learn more?
(Other definitions for morose that I've seen before include "Sullen and moody" , "Sullen, crabby" , "Sullen. bad-tempered" , "Melancholy" , "Gloomy and unsociable" .)