Cared about a group of servicemen (5)

I believe the answer is:

cadre

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

'group of servicemen' is the definition.
'cadre' can be an answer for 'group' (I've seen this before). I'm not certain of the 'of servicemen' bit.

'cared about a' is the wordplay.
'cared' can be anagrammed to 'CADRE'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for cadre that I've seen before include "Raced (anag) -- small inner group of activists" , "Small group of people trained for a purpose" , "Political group" , "Raced around with group" , "Group of key personnel" .)

I've seen this clue in The Irish Independent.

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