Cryptic crossword clue
Formerly working with civil engineer 4

The most common and most likely answer to this crossword clue is the 4 letter word ONCE

I've seen this crossword clue in The Times
O
N
C
E


Buddy explains!

The straight part
We know that "Formerly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case formerly = once.
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 ONCE mean?

ONCE adverb
  1. (frequency) One and only one time.
  2. (temporal location) Formerly; during some period in the past.
  3. Multiplied by one: indicating that a number is multiplied by one.
  4. As soon as.
  5. At a future time.
ONCE conjunction
  1. As soon as; when; after.

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