Clever office worker Ed initially embarrassed is easily riled (5-8)

'easily riled' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives sometimes define each other.

'clever office worker ed initially embarrassed' is the wordplay.
'clever' becomes 'quick' (synonyms).
'office worker' becomes 'temp' (temporary worker in an office).
'initially' suggests taking the first letters.
'embarrassed' becomes 'red' (someone may blush or go red when embarrassed).
The initial letter of 'ed' is 'e'.
'quick'+'temp'+'e'+'red'='QUICK-TEMPERED'

'is' is the link.

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