Missing a Mexican drink before a French salad (7)

I believe the answer is:

mesclun

'salad' is the definition.
(type of salad)

'missing a mexican drink before a french' is the wordplay.
'missing' is a deletion indicator.
'mexican drink' becomes 'mescal' (Mexican alcoholic drink).
'before' says to put letters next to each other.
'a french' becomes 'un' ('a' in French).
'mescal' with 'a' removed is 'mescl'.
'mescl'+'un'='MESCLUN'

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