Mostly they enjoy similar things (3,4)

I believe the answer is:

the like

'similar things' is the definition.
(I've seen this before)

'mostly they enjoy' is the wordplay.
'mostly' means to remove the last letter (most but not all of the word).
'enjoy' becomes 'like' (like can mean to appreciate or enjoy something).
'they' with its last letter taken away is 'the'.
'the'+'like'='THE LIKE'

(Another definition for the like that I've seen is " Similar things".)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.