Fashions that bring a fathead sad distress (4)
I believe the answer is:
fads
'fashions that' is the definition.
'fads' can be an answer for 'fashions' (fad is a kind of fashion). I'm not certain of the rest of the definition.
'a fathead sad distress' is the wordplay.
'a fathead' becomes 'f' (head letter of 'fat').
'distress' is an anagram indicator.
'sad' anagrammed gives 'ads'.
'f'+'ads'='FADS'
'bring' acts as a link.
Can you help me to learn more?
(Other definitions for fads that I've seen before include "Fashions or vogues" , "Short-lived crazes" .)