Airman touring a rocket centre showing little activity (7)

I believe the answer is:

flicker

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'little activity' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'airman touring a rocket centre' is the wordplay.
'airman' becomes 'flier' (synonyms).
'touring' indicates putting letters inside (tour can mean to go around).
'centre' says to take the centre.
The middle of 'rocket' is 'ck'.
'flier' placed around 'ck' is 'FLICKER'.

'showing' is the link.

Can you help me to learn more?

(Other definitions for flicker that I've seen before include "Glimmer" , "Shine unsteadily; waver" , "Burn or shine unsteadily" , "Twinkle" , "Spark" .)

I've seen this clue in the Evening Standard.

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