I'm not sure if this is the expected solution, it didn't come with any rules.

A couple of the fits are a bit snug but I put that down to laser cutting tolerances.
A collection of stuff that I probably found out the hard way.

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| For those who don't get it, it's sending the passcode to the actual device that is attempting access |
| letters | clued as | |
| EL | Train, Railway | why? |
| OTT | Baseball player, Mel | why? |
| TY | Baseball player, Cobb | why? |
| A, A's | Baseball team, Oakland team | why? |
| clue | suggests | |
| ! | An exclamation mark usually means that the entire clue should be read two different ways, rather than looking to seperate it into two clauses | |
| ? | An question mark usually means that the wordplay in the answer may be even more groan-worthy in terms of punnishness. | |
| Reverend Spooner | Two words will have their prefixes phonetically switched. To shout across the harbour might be a "Bay Hail" which is also clued as a "Hay Bale". |
why? |