Sloe gin is ordered for lots of soldiers (7)

I believe the answer is:

legions

I'm a little stuck... Click here to teach me more about this clue!

'lots of soldiers' is the definition.
The answer and definition can be both groups as well as being plural nouns.
Maybe you can see an association between them that I don't see?

'sloe gin is ordered' is the wordplay.
'is ordered' indicates an anagram.
'sloe'+'gin'='sloegin'
'sloegin' anagrammed gives 'LEGIONS'.

'for' is the link.

Can you help me to learn more?

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