Crossword Genius

Showing some turn of pace, it's topping (3)

Ross

I believe the answer is:

cap

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

'showing' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cap that I've seen before include "'If the . . . fits, wear it' (3" , "Peaked hat" , "Soft headgear" , "Surpass with headwear" , "Stopper" .)

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