Lecturing before feeling the effects of flu? (7)

I believe the answer is:

preachy

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'lecturing before feeling the effects of flu?' is the definition.
I can't judge whether this defines the answer.

'before feeling the effects of flu?' is the wordplay.
'before' becomes 'pre' (prefix meaning 'before').
'feeling the effects of flu?' becomes 'achy' (flu causes aches).
'pre'+'achy'='PREACHY'

Can you help me to learn more?

(Other definitions for preachy that I've seen before include "Tediously moralistic" , "Sanctimonious" , "Given to tedious moralising" .)

I've seen this clue in The Independent.

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