Involve English and Latin composition (6)
I believe the answer is:
entail
'involve' is the definition.
(entail means to involve or require)
'english and latin composition' is the wordplay.
'english' becomes 'e' (abbreviation).
'and' says to put letters next to each other.
'composition' indicates an anagram.
'latin' anagrammed gives 'ntail'.
'e'+'ntail'='ENTAIL'
(Other definitions for entail that I've seen before include "Estate settled" , "Have as a logical consequence" , "Bring on, involve" , "Involve or require" , "Restriction on inheritance" .)