Lay into team at Euros (7)
I believe the answer is:
amateur
'lay' is the definition.
('amateur' can be similar in meaning to 'lay')
'into team at euros' is the wordplay.
'into' indicates the answer is hidden within the clue.
'AMATEUR' is hidden in the letters of 'team at euros'.
(Other definitions for amateur that I've seen before include "Unpaid player" , "Layperson" , "Unpaid (sportsman}" , "refusing payment" , "hobbyist" .)