Dose of Aspirin, for example, efficient in races (6)

I believe the answer is:

tablet

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

'dose' is the definition.
(tablet is a kind of dose)

'efficient in races' is the wordplay.
'efficient' becomes 'able' (I've seen this before).
'in' is an insertion indicator.
'races' becomes 'tt' (Isle of Man Tourist Trophy races).
'able' inserted into 'tt' is 'TABLET'.

'of aspirin for example' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for tablet that I've seen before include "Let bat provide a pill" , "panel with an inscription" , "A small pill or an inscribed panel on wall" , "Small slab or flat pill" , "Battle (anag) - pill" .)

I've seen this clue in The Independent.

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