Shanties including trendy elements to add flavour (10)
I believe the answer is:
seasonings
'shanties' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.
'including trendy elements to add flavour' is the wordplay.
'including' means one lot of letters goes inside another.
'trendy' becomes 'in' ('in' can mean fashionable).
'elements' becomes 'gs' (I can't justify this - if you can you should believe this answer much more).
'to' means one lot of letters go next to another (I've seen this in other clues).
'add flavour' becomes 'season' (I've seen this before).
'gs' after 'season' is 'seasongs'.
'in' placed into 'seasongs' is 'SEASONINGS'.
Can you help me to learn more?