Every year, a chap flips lid (6)
I believe the answer is:
panama
'lid' is the definition.
(lid can mean hat - Panama is an example)
'every year a chap flips' is the wordplay.
'every year' becomes 'pa' (per annum).
'chap' becomes 'man' (I've seen this before).
'flips' shows that the letters should be reversed in order.
'a'+'man'='aman'
'aman' backwards is 'nama'.
'pa'+'nama'='PANAMA'
(Other definitions for panama that I've seen before include "isthmus" , "country divided by boaters?" , "Great American canal or tropical hat" , "Wide-brimmed hat" , "Hat woven from jipijapa leaves" .)