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Head of military brought in to sign for tanks (9)

Ross

I believe the answer is:

aquariums

'tanks' is the definition.
(I know this)

'head of military brought in to sign' is the wordplay.
'head of' indicates taking the first letters.
'brought in to' is an insertion indicator.
'sign' becomes 'aquarius' (Aquarius is an example).
The initial letter of 'military' is 'm'.
'm' going into 'aquarius' is 'AQUARIUMS'.

'for' is the link.

(Another definition for aquariums that I've seen is " Tanks or bowls for fish".)

I've seen this clue in The Telegraph.
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