Crossword Genius

Following on is straightforward (7)

Ross

I believe the answer is:

sincere

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

'following on' is the wordplay.
'following' becomes 'since' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' becomes 're' ('on' can be mean 'with reference to').
'since'+'re'='SINCERE'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for sincere that I've seen before include "Genuine; deceit-free" , "Lacking in deceit" , "Free from pretence" , "Free from deception" , "Candid" .)

I've seen this clue in The Telegraph, The Sun and The Independent.
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