Crossword Genius

Husband brought rail out as a guide for sailors (7,5)

Ross

I believe the answer is:

harbour light

I'm a little stuck... Click here to teach me more about this clue!

'a guide for sailors' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'husband brought rail out' is the wordplay.
'husband' becomes 'h' (abbreviation).
'out' indicates an anagram (out can mean wrong or inaccurate).
'brought'+'rail'='broughtrail'
'broughtrail' is an anagram of 'arbourlight'.
'h'+'arbourlight'='HARBOUR-LIGHT'

'as' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app