Anodynes needed for father among assassins! (11)

I believe the answer is:

painkillers

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'anodynes' is the definition.
('painkiller' can be a synonym of 'anodyne')

'father among assassins' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'among' becomes 'in' (eg among or in a group).
'assassins' becomes 'killers' (I am not sure about this - if you are sure you should believe this answer much more).
'pa'+'in'+'killers'='PAINKILLERS'

'needed for' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish News.

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