Monarch fled, joining endeavour that would involve silly journeys? (8)

I believe the answer is:

errantry

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'monarch fled joining endeavour that would involve silly journeys?' is the definition.
The definition suggests a singular noun which matches the answer.

'monarch fled joining endeavour' is the wordplay.
'monarch' becomes 'ER' (abbreviation for Elizabeth Regina).
'fled' becomes 'ran' (ran away).
'joining' means one lot of letters go next to another.
'endeavour' becomes 'try' (synonyms).
'er'+'ran'+'try'='ERRANTRY'

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(Other definitions for errantry that I've seen before include "Way of life of wandering knight" , "Wandering for adventures" , "rambling" , "Knightly adventuring" , "From adventurous travel" .)

I've seen this clue in The Telegraph.

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