Trump picked up seaweed close to major battle site (9)
I believe the answer is:
trafalgar
'battle site' is the definition.
'trafalgar' can be an answer for 'battle' (I've seen this before). I am not sure about the 'site' bit.
'trump picked up seaweed close to major' is the wordplay.
'trump' becomes 'fart' (both can mean flatulence).
'picked up' shows that the letters should be reversed in order.
'seaweed' becomes 'alga' (singular form of 'algae').
'close to' indicates one should take the final letters (the 'close' to the word).
The last letter of 'major' is 'r'.
'fart' back-to-front is 'traf'.
'traf'+'alga'+'r'='TRAFALGAR'
Can you help me to learn more?
(Other definitions for trafalgar that I've seen before include "London Square with Nelson column" , "London Square and Nelson sea-battle" , "Nelson battle and London Square" , "Cape" , "Victory of 1805" .)