Narrated start of romp filled with happiness (7)

I believe the answer is:

'narrated' is the definition.
(relating is a kind of narrating)

'start of romp filled with happiness' is the wordplay.
'start of' suggests taking the first letters.
'filled with happiness' becomes 'elated' (elated means very happy).
The initial letter of 'romp' is 'r'.
'r'+'elated'='RELATED'

(Other definitions for related that I've seen before include "Connected by family ties" , "Narrated; connected" , "Connected, by kinship say" , "Father and son have to be" , "were sympathetic" .)

I've seen this clue in The Telegraph.

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