Nauseous and sweaty at first? Ugh! (4)
I believe the answer is:
sick
'nauseous' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'sweaty at first? ugh' is the wordplay.
'at first?' says to take the initial letters (I've seen 'at first' mean this).
'ugh' becomes 'ick' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The initial letter of 'sweaty' is 's'.
's'+'ick'='SICK'
'and' is the link.
Can you help me to learn more?
(Other definitions for sick that I've seen before include "well? Hardly" , "not good" , "Bad" , "Ill, unwell" , "Ill; perverted" .)