Crossword Genius

Describe old aircraft in talk (7)

Ross

I believe the answer is:

explain

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'describe' is the definition.
(I've seen this before)

'old aircraft in talk' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'aircraft in talk' becomes 'plain' (I can't explain this - if you can you should believe this answer much more).
'ex'+'plain'='EXPLAIN'

Can you help me to learn more?

(Other definitions for explain that I've seen before include "Describe" , "Justify" , "Give reason for" , "Expound" , "Shed light" .)

I've seen this clue in The Guardian.
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