Weedy fathead at the bar (5)
I believe the answer is:
frail
'weedy' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?
'fathead at the bar' is the wordplay.
'fathead' becomes 'f' (head letter of 'fat').
'at' means one lot of letters go next to another.
'the bar' becomes 'rail' (rail is a kind of bar).
'f'+'rail'='FRAIL'
Can you help me to learn more?
(Other definitions for frail that I've seen before include "rush" , "Easily shattered" , "hobbling around?" , "Decrepit" , "Struggling to get about" .)