Crossword Genius

Take control and ring to get specific vaccines? (4,3,5)

Ross

I believe the answer is:

call the shots

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

'take control' is the definition.
'call the shots' can be an answer for 'control' (thesaurus). I am unsure of the 'take' bit.

'ring to get specific vaccines?' is the wordplay.
I cannot really understand how this works, but
'ring' could be 'call' (call on the phone) and 'call' is found in the answer.
'specific' could be 'the' ('the' is used to refer to a specific item) and 'the' is located in the answer.
The remaining letters 'shots' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'and' is the link.

Can you help me to learn more?

(Other definitions for call the shots that I've seen before include "Be in control" , "Exercise authority" , "Take the lead" , "Be in charge" , "Be in command" .)

I've seen this clue in The Irish Times.
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