It's bright ahead - explain that (5,2)

I believe the answer is:

clear up

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'explain that' is the definition.
'clear up' can be an answer for 'explain' (I've seen this before). I am not certain of the remainder of the definition.

'it's bright ahead' is the wordplay.
'it's bright' becomes 'clear' (I've seen this before).
'ahead' becomes 'up' (similar in meaning).
'clear'+'up'='CLEAR-UP'

Can you help me to learn more?

(Other definitions for clear up that I've seen before include "Tidy; explain; cure" , "Get better" , "be less untidy" , "how conditions may improve" , "Free from confusion - tidy" .)

I've seen this clue in The Irish Times.

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