Somewhat dejected from constant involvement in wild dancing (6)
I believe the answer is:
mopish
'somewhat dejected' is the definition.
'mopish' can be an answer for 'dejected' (I've seen this before). I'm not certain of the 'somewhat' bit.
'constant involvement in wild dancing' is the wordplay.
'constant' becomes 'pi' (mathematical constant).
'involvement in' is an insertion indicator (inserted letters get involved in others).
'wild dancing' becomes 'mosh' (I can't explain this - if you can you should give a lot more credence to this answer).
'pi' placed into 'mosh' is 'MOPISH'.
'from' is the link.
Can you help me to learn more?
(Other definitions for mopish that I've seen before include "down in the dumps" , "Listless" , "Somewhat depressed" , "dejected" , "low on spirits" .)