Extremely shady round the side but very humid (6)
I believe the answer is:
steamy
'very humid' is the definition.
'steamy' can be an answer for 'humid' (synonyms). I am not certain of the 'very' bit.
'extremely shady round the side' is the wordplay.
'extremely' says to hollow out the word (remove centre letters).
'round' indicates putting letters inside.
'the side' becomes 'team' (I've seen this before).
'shady' with its centre removed is 'sy'.
'sy' enclosing 'team' is 'STEAMY'.
'but' is the link.
Can you help me to learn more?
(Other definitions for steamy that I've seen before include "Erotic, sexy" , "Full of vapour; erotic (book)" , "risque behaviour?" , "Full of condensation; erotic (story)" , "My seat (anag.)" .)