Crossword Genius

Tranquillity Base involved in step (5)

Ross

I believe the answer is:

peace

'tranquillity' is the definition.
(I know that peace is a type of tranquillity)

'base involved in step' is the wordplay.
'base' becomes 'e' (Euler's number - base of natural logarithms).
'involved in' indicates putting letters inside.
'step' becomes 'pace' (pace is a kind of step).
'e' inserted within 'pace' is 'PEACE'.

(Other definitions for peace that I've seen before include "A Christmas wish" , "Calm, tranquility" , "Calmness" , "See 1" , "State of freedom from war" .)

I've seen this clue in The Independent.
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