Crossword Genius

Explore dark places in railway without old tinder (7)

Ross

I believe the answer is:

spelunk

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

'explore dark places' is the definition.
'spelunk' can be an answer for 'explore' (I know that spelunk is a type of explore). I am not certain of the 'dark places' bit.

'railway without old tinder' is the wordplay.
'railway' becomes 'El' (El train, short for elevated railway).
'without' indicates putting letters inside (some letters go outside or 'without' others).
'old tinder' becomes 'spunk' (synonyms. I am not sure about the 'old' bit.).
'el' going inside 'spunk' is 'SPELUNK'.

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app