Crossword Genius

Serviceman spied jumping up and down regularly (5,10)

Ross

I believe the answer is:

manic depressive

'up and down regularly' is the definition.
(person experiencing extremes of mood)

'serviceman spied jumping' is the wordplay.
'jumping' is an anagram indicator.
'serviceman'+'spied'='servicemanspied'
'servicemanspied' anagrammed gives 'MANIC-DEPRESSIVE'.

(Another definition for manic depressive that I've seen is " Fry, perhaps".)

I've seen this clue in The Guardian.
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