Sloe gin is bad 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 definition and answer can be both groups as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'sloe gin is bad' is the wordplay.
'is bad' is an anagram indicator (I've seen 'being bad' mean this).
'sloe'+'gin'='sloegin'
'sloegin' with letters rearranged gives 'LEGIONS'.

'for' is the link.

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