Cryptic crossword clue
One Spanish railway having a single component 5

The most common and most likely answer to this crossword clue is the 5 letter word UNARY

U
N
A
R
Y

Buddy explains!

The straight part
We know that "single component" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case single component = unary.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does UNARY mean?

UNARY noun
  1. The unary numeral system; the bijective base-1 numeral system.
  2. Unary coding, an entropy encoding for natural numbers.
UNARY adjective
  1. Consisting of or involving a single element or component.
  2. (computer engineering) Of an operation, function, procedure or logic gate, taking exactly one operand, argument, parameter or input; having domain of dimension 1.

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